Difference between revisions of "OpenFOAM/C3/Importing-mesh-file-in-OpenFOAM/English-timed"

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(Created page with "{|border=1 | '''Time''' | '''Narration''' |- | 00:00 | Hello and welcome to the spoken tutorial on '''Importing Mesh files in OpenFOAM''' |- |00:07 | In this tutorial, you w...")
 
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| In this tutorial, you will learn to:
 
| In this tutorial, you will learn to:
* import '''Mesh files'''
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* Import '''Mesh files'''
 
* from a meshing software
 
* from a meshing software
 
* in '''OpenFOAM'''.
 
* in '''OpenFOAM'''.

Revision as of 15:39, 27 November 2015

Time Narration
00:00 Hello and welcome to the spoken tutorial on Importing Mesh files in OpenFOAM
00:07 In this tutorial, you will learn to:
  • Import Mesh files
  • from a meshing software
  • in OpenFOAM.
00:14 To record this tutorial I am using
  • Linux Operating system Ubuntu version 12.04.
  • OpenFOAM version 2.1.1
  • ParaView version 3.12.0
00:26 As a pre-requisite, the user should know how to generate a Mesh in software like -

Gambit, Ansys ICEM , CFX, Salome etc.

00:40 *Using blockMesh, we can easily make simple geometries.*For example- box, pipe etc.
  • It is difficult to create complex geometries using blockMesh.
00:53 *But OpenFOAM supports importing mesh from third party meshing software.
  • There are commands available in OpenFOAM, to import these mesh files.
01:05 We will now learn to import these files.
01:08 Here is the geometry of our case.

We have a square cylinder

  • length 1m and height 1m.
  • Inlet velocity is 1 m/s
01:22 *We are solving this for a Reynolds Number (Re) = 100 *The domain chosen is 40m by 60m *The Boundary conditions are as shown in the diagram
01:36 This is the mesh file generated in a meshing software.
01:40 In your OpenFOAM working directory, go to the icoFoam solver and click on it.
01:47 Now Create a folder by the name cylinder
01:52 Now go to the cavity case.Copy the 0 and system folders from the cavity case.
01:59 Paste this inside the cylinder folder.Note that, you do not need the constant folder.
02:10 On my desktop, I have a Fluent mesh file with a .(dot) msh extension.It is named as cylmesh.msh
02:23 Copy-and-paste this file in the cylinder folder in icoFoam.Our setup is now ready.
02:32 Open the command terminal.Type run and press Enter.
02:37 Type cd tutorials; press Enter.
02:42 Type cd incompressible; press Enter.Type cd icoFoam; press EnterType cd cylinder and press Enter.
02:58 For a Fluent mesh file, in the command terminal we need to typefluentMeshToFoam note that (MTF) are capital here (space) cylmesh.mshand press Enter
03:20 On the terminal you will see that the mesh file is converted to openfoam data file
03:28 Now go back to the cylinder folder
03:31 The constant folder has been generated.Click on the constant folder to open it.
03:38 Transport Property file is missing from the constant folder
03:42 Go two levels back and copy the transport property from the constant folder of the cavity case.
03:53 Paste this inside the constant folder of cylinder which we created just now.We will keep the default viscosity.
04:05 Switch back to the terminal.
04:08 Note that we do not run blockMesh command here.To view the boundary conditions in the mesh file
04:15 Go to Constant > polyMesh.Type ls.You will see the boundary file.
04:25 Open it in any editor of your choice.
04:30 The boundary condition names are as seen in the geometry slide.
04:36 In case of any error with the boundary names, you can refer the boundary fileclose this.
04:45 In the terminal, go two levels back and go to the 0 folder.
04:52 Open the pressure file in the 0 folder.
04:57 Note that the boundary names should exactly match with the boundary file.Change them if needed.Close this file.
05:08 Go one level back and go to the system folder.
05:15 Open the controlDict file.
05:18 We will change the end time of controlDict file.Close this.
05:25 Go one level back.To start the iterations', type icoFoam and press EnterIterations running will be seen in the terminal.
05:39 To view the geometry, type paraFoam and press Enter.In the ParaView window, click on the Apply button in the object inspector menu.
05:53 You can see the geometry.In the Active variable control menu, change from solid color to U velocity
06:03 The initial velocity condition is seen here.
06:08 Click on the play button in the VCR menu on the top right-hand side.
06:15 We can see the velocity contours with the passage of time.
06:20 Close the paraview window.
06:23 Here is a list of command to import geometry from other meshing software.
  • ANSYS : ansysMeshToFoam space <filename>
  • IDEAS : ideasTofoam space <filename>
  • CFX : cfxToFoam space <filename>
  • SALOME : ideasUnvToFoam space <filename>

This brings us to the end of the tutorial.

06:54 As an assignment
  • Try importing the mesh file of circular cylinder.
  • Mesh file by the name circcyl.mshis provided with this tutorial.
  • Solve it using the icoFoam solver.
07:12 In this tutorial we learnt :
  • Importing geometry from other meshing software.
07:18 Watch the video available at this URL:http://spoken-tutorial.org/What_is_a_Spoken_Tutorial.It summarizes the Spoken Tutorial project.If you do not have good bandwidth, you can download and watch it
07:30 The Spoken Tutorial Project Team-Conducts workshops using spoken tutorials-Gives certificates to those who pass an online test-For more details, please write to contact@spoken-tutorial.org
07:46 Spoken Tutorials Project is a part of the Talk to a Teacher project,It is supported by the National Mission on Education through ICT, MHRD,Government of India.This project is coordinated by http://spoken-tutorialMore information on the same is available at the following URL linkhttp://spoken-tutorial.org/NMEICT-Intro
08:03 This is Rahul Joshi from IIT BOMBAY signing off.Thanks for joining

Contributors and Content Editors

PoojaMoolya, Pratik kamble, Sandhya.np14